President Mahama is part of a delegation headed by the chairperson of the Economic Community of West African States (ECOWAS)
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A week after conceding defeat, Jammeh on Friday declared he no longer accepted the results of the December 1 vote, upending hopes for a peaceful political transition after his 22 years in power.
President Mahama is part of a delegation headed by the chairperson of the Economic Community of West African States (ECOWAS) and Liberian leader, Ellen Johnson Sirleaf, Nigerian President Muhammadu Buhari and Sierra Leonian President Ernest Bai Koroma.
The President tweeted confirming his arrival. He said, "In Banjul, with other colleague Heads of State from the subregion, to help mediate post election issues in The Gambia."
Jammeh, who came to power in 1994 as a 29-year-old army officer following a military coup, had won four previous polls. Barrow received 263,515 votes while Jammeh won 212,099, Alieu Momarr Njai, the electoral commission head, said in the capital Banjul.
He declared Gambia an Islamic Republic last year.
Read more: Mahama ends era of 'Johns in Ghana politics'
Eight opposition parties united behind Barrow and the election campaign period featured large opposition rallies and unprecedented expressions of frustration with Jammeh's rule.
The UN Security Council demanded that Gambia's leader Yahya Jammeh hand over power.
Still, Jammeh had projected confidence, saying his victory was all but assured by God and predicting "the biggest landslide in the history of the country." Yahya Jammeh announced a legal challenge to an election in which he had already conceded defeat, in a weekend of dramatic twists that sparked international furore and fear of a crackdown. We await to see the outcome.